while the high-fire switch is rated at -0

the cartridge has likely suffered a bearing failure or a locked rotor

Key Benefits Fail-Safe Operation: Mechanical spring return ensures the valve stem raises upon loss of air pressure to prevent system overheating or flooding

making it ideal for standard zone control and intermittent flow management in HVAC systems

or flame sense issues

Watts 0794090 Kit 328140-751 while the high-fire switch isThe Watts 0794090 repair kit is an essential field service solution for rehabilitating the 4 inch 909 Reduced Pressure Zone (RPZ) backflow preventer. This lead free total rubber parts kit provides everything required for a full relief valve overhall and check assembly maintenance to ensure the potable water supply remains protected from backsiphonage and backpressure. Engineered for high flow commercial plumbing applications, the kit features high